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- W2024709580 abstract "The heliographic latitude-longitude structure of high speed solar wind streams observed prior to the maximum of solar cycle 20 has been studied with a multi-spacecraft comparison. Plasma and magnetic field data obtained near the earth by Explorers 34 and 35 during mid-1967 were mapped radially inward to the location of Mariner 5, which was making simultaneous measurements at lower heliographic latitudes. For latitude separations less than 3.5°, cross-correlations of the Explorer-Mariner velocities showed only the previously reported systematic increase in velocity with latitude. However, for latitude separations ranging from 3.5° to 6.2°, significant differences in the high speed stream structure of up to 250 km/s were seen. For these stream structures, the multi-spacecraft observations made possible the separation of spatial from temporal variations with little ambiguity. Within one interval, the higher-latitude Explorers saw a single, broad stream while the lower-latitude Mariner saw a series of three relatively narrow streams. Within a second interval, a single high speed stream was observed at both locations which was sloped at an angle of 70°–80° from solar north-south direction. These stream structures, which were also seen by Pioneers 6 and 7, imply the existence of large, temporary, local north-south velocity gradients, or wind shears, ranging up to 60 km/s/deg. The latitude separations found for these structural differences were the smallest yet observed in spacecraft data and hence involved shorter corotation delays than those of any previous study. The multi-spacecraft comparisons also led to the identification of several intervals of time when individual high speed streams shifted substantially in either longitude and/or amplitude on a time scale of one solar rotation. Possible flare-related disturbances were found to be too small to account for these large observed changes." @default.
- W2024709580 created "2016-06-24" @default.
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- W2024709580 date "1981-01-01" @default.
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- W2024709580 title "Multi-spacecraft observations of heliographic latitude-longitude structure in the solar wind" @default.
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